OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, OPTICAL INFORMATION RECORDING AND REPRODUCING METHOD, AND REPRODUCING DEVICE

摘要

In recording and reproducing devices that use angular-multiplexing holography, accessing a recorded hologram of interest had taken time because after positioning at the vicinity of the hologram, it had been necessary to carry out fine adjustment of the position while checking the signal quality of the hologram. The optical information recording and reproducing device according to the present invention uses angular-multiplexing to record interference patterns formed from a signal beam and a reference beam onto an optical information recording medium as page data and reproduces information from the optical information recording medium, said optical information recording and reproducing unit being provided with: a light-source unit that outputs light; an optical splitting unit that splits the light into a reference beam and a signal beam; an angle controlling unit that controls the angle for the direction of angle multiplexing at which the reference beam enters the optical information recording medium; an optical detecting unit that detects a reproduced image that is reproduced by using the reference light; and a position control unit that controls the position relationship between the reference beam and the optical information recording medium. The device treats a set of page data as a book, and during recording, at least a portion of the page data in adjacent books is recorded while the entrance angle for the direction of angular-multiplexing for the reference light is shifted by means of the angle controlling unit. During reproduction, at least a portion of the light amount of a reproduced image is detected by using the optical detecting unit, and the position of the book is detected on the basis of information about the detected light amount.

主权项

1. An optical information recording and reproducing device for recording an interference pattern of signal light and reference light as page data on an optical information recording medium through angular-multiplexing and reproducing information from the optical information recording medium, comprising:
a light source unit that emits light; an optical splitting unit that splits the light into reference light and signal light; an angle control unit that controls an angle in an angle multiplexed direction of the reference light that is incident on the optical information recording medium; an optical detection unit that detects a reproduced image reproduced by the reference light; and a position control unit that controls a position relationship between the reference light and the optical information recording medium, wherein a set of page data is treated as a book, and during recording, at least a part of the page data in adjacent books is recorded while an incident angle in the angle multiplexed direction for the reference light is shifted by the angle control unit, and during reproduction, at least a part of a light amount of a reproduced image is detected by the optical detection unit, and a position of the book is detected on a basis of information about the detected light amount.